John grant



@uiten taies. gat-mt ffirr.4

Letters Patent No. 75,411, dated March 10, 1868.

IMPROVEMENT IN GRINDER FOR KNIVES FOR PLANERS.

@the Segnale :stemt in in tigen Titten @anni submitting pitt nt tigtsmite.

,TO ALL WHOM IT MAY CONOERN:

Be it known that I, JOHN GRANT, of Northampton, Hampshire county,Commonwealth of Massachusetts, have invented a new and useful improvedPlaner-Knife Grinder; and I do herebydeclare that the following is afull and exact description thereof, reference being had to theaccompanying drawings, and to the letters of reference marked thereon.In the drawings- Y Figure 1 represents a front view.

Figure 2 a plan view, and

Figure 3 a vertical section of my invention.

This invention is a device by which planer-knives may be sharpenedeasily, and with regularity of bevel.

It consists of a frame, A A, having a shaft, B, set in bearings a a uponeach side of the frame. Up'on this shaft B is a block, C, upon which theknives are set, so that their edges may be brought in contact with anemery-.vheel,D. This emery-wheel is arranged upon a spindle,' F, so thatthe latter, in turning, turns the wheel with it. Yet the wheel can bemoved laterally along the spindle without interrupting the revolution ofeither. This is accomplished by means of a groove, Zz, running thelength of the spindle in its surface, into which tits a pin set in theshoulder of the emery-Wheel.

The device for moving the emery-wheel laterally, consists of a piece, G,which straddles the wheel, the spindle F passing through its ends c c,while the other end, d, has threads out through it, in which works ascrew, H, working in bearings e e in the sides of the frameA A. Upon thecontinued end of this screw is placed-a crank, so that, lby turning thelatter,` the emery-wheel is moved in either direction, as may bedesired, along the edge ofthe knife-blade. A pulley, I, upon one end ofthe spindle F, allows power to be applied. I

The advantages of this device are that the knives may be easily ground,and'pertcctly regularted, with far less work than by hand, and withoutnecessitating the removal of the knives from the planer.

Now, having described my invention, what claim as new, and desire tosecure by Letters Patent, is-

A device for sharpening the knives of planers-and similar tools,consisting nf the screw H, piece G, wheel D, and ground spindle F, theparts and the whole being constructed and arranged substantially asshown.

JOHN GRANT.

Witnesses:

EDWARD H. HYDE, It. F. HYDE.

